CN103602915A - High-carbon high-chromium duplex stainless steel - Google Patents
High-carbon high-chromium duplex stainless steel Download PDFInfo
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Abstract
The invention relates to duplex stainless steel, and particularly relates to duplex stainless steel containing high-carbon and high-chromium elements and a production process thereof. The stainless steel provided by the invention comprises the following chemical components in percentage by weight: 0.20-0.35% of C, 22-26% of Cr, 10-14% of Ni, 2-5% of Mo, 1-5% of Cu, 0.5-4% of V, 0.5-5% of W, less than or equal to 0.015% of S, less than or equal to 0.015% of P, less than or equal to 1% of other impurity elements and the balance of Fe. In the duplex stainless steel provided by the invention, the carbon content of the stainless steel is increased, the alloy strength and hardness are improved, and the wear resistance is enhanced; apart from the commonly used elements Cr, Ni and Mo, the alloy is also added with the elements Cu, W and V, thus the tensile strength and hardness of the alloy are greatly improved under the condition of guaranteeing enough corrosion resistance of the duplex stainless steel.
Description
Technical field
The present invention relates to duplex stainless steel, especially a kind of duplex stainless steel and production technique thereof containing high-carbon and high chromium element.
Background technology
Along with the development of modern industrial technology, more and more higher to the over-all properties requirement of material, particularly in the stronger industry of the corrodibility such as oil, chemical industry, boats and ships.The austenitic stainless steel of early stage multiplex rich nickel is as the material of working in corrosive atmosphere.Practice shows, duplex stainless steel is more anti-corrosion than austenitic steel, and has good comprehensive mechanical property and welding property.In recent years, to duplex stainless steel, research is mainly on low-carbon (LC) (being generally 0.01%～0.08%C) basis.But low carbon dual-phase stainless steel, in actual production, has increased production difficulty and cost thereby need to carry out carbonization treatment.As everyone knows, carbon is to improve one of effective, the most most economical element of alloy strength, but up to the present, the report of relevant high carbon dual-phase stainless steel is fewer.The people such as ChristofMessne have used the duplex stainless steel containing 0.2% carbon when the affecting of research rolling parameter alloy surfaceness, but do not relate to tissue and the performance of material itself.Therefore, high carbon and chromium duplex stainless steel has been carried out to a series of research herein, analyzed tissue and the performance of high carbon dual-phase stainless steel, for this class alloy, further studied, effective foundation and guidance are provided.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of high carbon and chromium duplex stainless steel and production technique thereof, in actual production, draw materials conveniently, can reduce production costs, increase work efficiency.
High carbon and chromium duplex stainless steel of the present invention, by weight percentage, this stainless chemical composition is as follows: 0.20-0.35%C, 22-26%Cr, 10-14%Ni, 2-5%Mo, 1-5%Cu, 0.5-4%V, 0.5-5%W, S≤0.015%, P≤0.015%, other impurity element≤1%, surplus is Fe.
In the present invention, carbon content is 0.2-0.35%, and C is effective austenite former.Add after higher carbon element, it can form alloy carbide with the alloying element such as chromium, vanadium and tungsten and improve alloy strength and hardness, increases wear resisting property.In addition, because the carbon content of ordinary scrap steel is all below 0.3%, in production process, there is not carburetting, so normal smelting technique can guarantee that carbon content is within claimed range of the present invention.Because the present invention itself requires high carbon content, common melting can obtain the carbon content needing, so in actual production, alloy is without falling through carbonization treatment, and low production cost and difficulty.
In the present invention, chrome content is 22-26%, and Cr is topmost element in stainless steel, and particularly resistance to pitting attack performance of heavy alloyed erosion resistance can be obviously put forward in the increase of chromium element.But when chromium content surpasses 27%, easily compound between precipitating metal, causes the thermoplasticity of alloy and welding property to reduce.In order to make high carbon dual-phase stainless steel have good over-all properties, in the present invention, the add-on of chromium is 22-26%.
Nickel is to expand austenitic area element, and higher nickel content, can make austenite content in steel increase.In the present invention, nickel content is 10-14%, can improve Alloy Anti high temperature oxidation and corrosion resistance nature, plays stable austenite and acts on mutually.When nickel content is too much or very little time, all can not obtain balanced two-phase structure, what cause obtaining duplex stainless steel should have performance.
In the present invention, containing molybdenum amount, be 2-5%, Mo is the same with Cr element is ferrite former, and can significantly improve the corrosion resistance nature of duplex stainless steel, particularly resistance to pitting attack performance.But when molybdenum content is too many, σ phase or the χ that can separate out rich chrome molybdenum cause alloy partial properties to decline mutually.
In the present invention, copper content is 1-5%, and Cu is austenite former, can improve the solidity to corrosion of alloy in sour environment.When stainless steel of the present invention is during 400-500 ℃ of timeliness, Cu Rich Phase Precipitation, can strengthen age hardening.In the duplex stainless steel of tungstenic, add copper can reduce the maximum Precipitation Temperature of σ phase.
In the present invention, tungstenic amount is 0.5-5%, and W is ferrite former.Carrying on heavy alloyed corrosion resistance nature, the effect of tungsten is very similar to molybdenum.When part tungsten replaces molybdenum, can also increase the impelling strength of alloy.In Gao Ge, molybdenum alloy, too much tungsten can increase separating out of intermetallic compound, therefore general≤5%.
In the present invention, vanadiumcontent is 0.5-4%, and V is ferrite former, plays Grain refinement, can form stabilizer pole and highly dispersed carbide and intermetallic compound, thereby put forward heavy alloyed hot strength and thermostability.When content of vanadium surpasses 4%, low-alloyed thermoplasticity can be fallen.
Test of long duration through contriver is definite, and by weight percentage, this stainless chemical composition is as follows: 0.25%C, 26%Cr, 13%Ni, 3%Mo, 2.5%Cu, 2%V, 3%W, S≤0.015%, P≤0.015%, and other impurity element≤1%, surplus is Fe.
Produce stainless technique of the present invention, concrete steps are as follows:
(1) melting casting is cast into ingot casting in 1550-1650 ℃ by raw material after according to said ratio mixed melting;
(2) forge above-mentioned ingot casting is forged into steel plate at 1150 ℃-1200 ℃;
(3) rolling is rolled into steel plate by the steel plate after forging at 1050-1150 ℃;
(4) solution treatment is heated to 1150-1300 ℃ by the steel plate after rolling, and product quenches to obtain after insulation 20-60min.
The high carbon and chromium duplex stainless steel of proportioning of the present invention, due to alloying element kind and content all more, for increasing solid solution degree and obtaining more balanced austenite phase and ferritic phase tissue.After lot of experiments, determine, best solid solution temperature is 1150-1300 ℃, shrend or oil quenching.In this temperature range, can guarantee that carbide dissolves as far as possible, can guarantee again ferrite and austenitic ratio.As temperature is too low, can not guarantee that carbide dissolves as far as possible, the higher and coarse grains of the too high ferrite content of temperature.
In sum, the present invention has following beneficial effect:
1, increase the carbon content in duplex stainless steel, suitably put forward high nickel content, and adopted higher solid solution temperature, improved alloy strength and hardness, increased wear resisting property, and in actual production, got starting material convenient, reduced production cost and difficulty;
2, in alloy except conventional Cr, Ni and Mo element, also added Cu, W and V element simultaneously, guaranteeing that duplex stainless steel has under enough corrosion resistance nature conditions, has improved tensile strength and the hardness of alloy greatly.
Accompanying drawing explanation
Fig. 1 is the metallograph of organizing of high carbon and chromium duplex stainless steel of the present invention;
In figure: 1 is austenite phase; 2 is ferritic phase.
Embodiment
Embodiment 1
A high carbon and chromium duplex stainless steel, by weight percentage, this stainless chemical composition is as follows: 0.35%C, 23%Cr, 12%Ni, 3.5%Mo, 4%Cu, 0.5%V, 2.7%W, 0.015%S, 0.010%P, 1% other impurity elements, surplus is Fe.
Its preparation technology's concrete steps are as follows:
(1) melting casting is cast into ingot casting in 1550 ℃ by raw material after according to said ratio mixed melting;
(2) forge above-mentioned ingot casting is forged into steel plate at 1200 ℃;
(3) rolling is rolled into steel plate by the steel plate after forging at 1100 ℃;
(4) solution treatment is heated to 1150 ℃ by the steel plate after rolling, and product quenches to obtain after insulation 60min.Embodiment 2
A high carbon and chromium duplex stainless steel, by weight percentage, this stainless chemical composition is as follows: 0.20%C, 25%Cr, 10%Ni, 2%Mo, 2%Cu, 3.1%V, 0.5%W, 0.015%S, 0.010%P, 1% other impurity elements, surplus is Fe.
Its preparation technology's concrete steps are as follows:
(1) melting casting is cast into ingot casting in 1570 ℃ by raw material after according to said ratio mixed melting;
(2) forge above-mentioned ingot casting is forged into steel plate at 1150 ℃;
(3) rolling is rolled into steel plate by the steel plate after forging at 1150 ℃;
(4) solution treatment is heated to 1300 ℃ by the steel plate after rolling, and product quenches to obtain after insulation 20min.Embodiment 3
A high carbon and chromium duplex stainless steel, by weight percentage, this stainless chemical composition is as follows: 0.25%C, 24%Cr, 14%Ni, 3%Mo, 5%Cu, 2.2%V, 5%W, 0.005%S, 0.015%P, 0.5% other impurity elements, surplus is Fe.
Its preparation technology's concrete steps are as follows:
(1) melting casting is cast into ingot casting in 1600 ℃ by raw material after according to said ratio mixed melting;
(2) forge above-mentioned ingot casting is forged into steel plate at 1170 ℃;
(3) rolling is rolled into steel plate by the steel plate after forging at 1050 ℃;
(4) solution treatment is heated to 1200 ℃ by the steel plate after rolling, and product quenches to obtain after insulation 40min.Embodiment 4
A high carbon and chromium duplex stainless steel, by weight percentage, this stainless chemical composition is as follows: 0.3%C, 26%Cr, 13%Ni, 4%Mo, 1%Cu, 1.3%V, 3.9%W, 0.010%S, 0.005%P, 1% other impurity elements, surplus is Fe.
Its preparation technology's concrete steps are as follows:
(1) melting casting is cast into ingot casting in 1650 ℃ by raw material after according to said ratio mixed melting;
(2) forge above-mentioned ingot casting is forged into steel plate at 1160 ℃;
(3) rolling is rolled into steel plate by the steel plate after forging at 1070 ℃;
(4) solution treatment is heated to 1170 ℃ by the steel plate after rolling, and product quenches to obtain after insulation 50min.Embodiment 5
A high carbon and chromium duplex stainless steel, by weight percentage, this stainless chemical composition is as follows: 0.27%C, 22%Cr, 11%Ni, 5%Mo, 3%Cu, 4%V, 1.6%W, 0.015%S, 0.010%P, 1% other impurity elements, surplus is Fe.
Its preparation technology's concrete steps are as follows:
(1) melting casting is cast into ingot casting in 1630 ℃ by raw material after according to said ratio mixed melting;
(2) forge above-mentioned ingot casting is forged into steel plate at 1190 ℃;
(3) rolling is rolled into steel plate by the steel plate after forging at 1130 ℃;
(4) solution treatment is heated to 1250 ℃ by the steel plate after rolling, and product quenches to obtain after insulation 30min.Embodiment 6
A high carbon and chromium duplex stainless steel, by weight percentage, this stainless chemical composition is as follows: 0.25%C, 26%Cr, 13%Ni, 3%Mo, 2.5%Cu, 2%V, 3%W, 0.015%S, 0.015%P, 1% other impurity elements, surplus is Fe.
Its preparation technology's concrete steps are as follows:
(1) melting casting is cast into ingot casting in 1650 ℃ by raw material after according to said ratio mixed melting;
(2) forge above-mentioned ingot casting is forged into steel plate at 1200 ℃;
(3) rolling is rolled into steel plate by the steel plate after forging at 1150 ℃;
(4) solution treatment is heated to 1250 ℃ by the steel plate after rolling, and product quenches to obtain after insulation 30min.Comparative example
The prepared two-phase stainless steel sample of above-described embodiment 1-6 and other duplex stainless steels are carried out to resistance to pitting performance and Mechanics Performance Testing.Resistance to pitting performance, according to GB GB4334.7, is measured in the 6%FeCl3+0.05MHCl solution of 35 ℃, and mechanical property is measured according to GB GB/T10623-2008, and it the results are shown in Table 1.
Table 1
| Specimen types | Corrosion rate (g(m 2·h） -1） | Tensile strength (MPa) | Unit elongation (%) | Hardness (HRC) |
[0064]?
| Embodiment 1 | 0.95 | 918 | 24 | 29 |
| Embodiment 2 | 0.73 | 905 | 24 | 28 |
| Embodiment 3 | 0.56 | 878 | 23 | 27 |
| Embodiment 4 | 0.43 | 892 | 24 | 27 |
| Embodiment 5 | 1.12 | 928 | 26 | 29 |
| Embodiment 6 | 0.42 | 913 | 25 | 28 |
| SAF2205 | 1.52 | 680 | 25 | 20 |
| SAF2507 | 0.35 | 797 | 29 | 24 |
As can be seen from Table 1, the resistance to pitting performance of duplex stainless steel of the present invention is between SAF2205 and SAF2507 stainless steel.The tensile strength intensity of duplex stainless steel of the present invention and hardness are obviously high and keep good unit elongation than SAF2205 and SAF2507 stainless steel.
Claims (3)
1. a high carbon and chromium duplex stainless steel, it is characterized in that, by weight percentage, this stainless chemical composition is as follows: 0.20-0.35%C, 22-26%Cr, 10-14%Ni, 2-5%Mo, 1-5%Cu, 0.5-4%V, 0.5-5%W, S≤0.015%, P≤0.015%, other impurity element≤1%, surplus is Fe.
2. high carbon and chromium duplex stainless steel according to claim 1, it is characterized in that: by weight percentage, this stainless chemical composition is as follows: 0.25%C, 26%Cr, 13%Ni, 3%Mo, 2.5%Cu, 2%V, 3%W, S≤0.015%, P≤0.015%, other impurity element≤1%, surplus is Fe.
3. stainless technique described in production claim 1, is characterized in that: concrete steps are as follows:
(1) melting casting is cast into ingot casting in 1550-1650 ℃ by raw material after according to said ratio mixed melting;
(2) forge above-mentioned ingot casting is forged into steel plate at 1150 ℃-1200 ℃;
(3) rolling is rolled into steel plate by the steel plate after forging at 1050-1150 ℃;
(4) solution treatment is heated to 1150-1300 ℃ by the steel plate after rolling, and product quenches to obtain after insulation 20-60min.
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| CN201310597084.7A CN103602915B (en) | 2013-11-22 | 2013-11-22 | High carbon and chromium duplex stainless steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108994229A (en) * | 2018-07-16 | 2018-12-14 | 成都先进金属材料产业技术研究院有限公司 | Manufacturing method for cold-working mold thickness band steel |
| CN115679225A (en) * | 2021-07-28 | 2023-02-03 | 叶均蔚 | High chromium silicon corrosion resistant steel and use thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4265605B2 (en) * | 2003-06-30 | 2009-05-20 | 住友金属工業株式会社 | Duplex stainless steel |
| CN101812647A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Diphase stainless steel and manufacturing method thereof |
| WO2011030709A1 (en) * | 2009-09-10 | 2011-03-17 | 住友金属工業株式会社 | Two-phase stainless steel |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4265605B2 (en) * | 2003-06-30 | 2009-05-20 | 住友金属工業株式会社 | Duplex stainless steel |
| CN101812647A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Diphase stainless steel and manufacturing method thereof |
| WO2011030709A1 (en) * | 2009-09-10 | 2011-03-17 | 住友金属工業株式会社 | Two-phase stainless steel |
Non-Patent Citations (3)
| Title |
|---|
| CHRISTOF MESSNER ET.AL.: "Thermally induced surface roughness in austenitic-ferritic duplex stainless steels", 《ACTA MATERIALIA》, vol. 51, 31 December 2003 (2003-12-31) * |
| S.SPIGARELLI ET AL.: "Constitutive equations for prediction of the flow behaviour of duplex stainless steels", 《MATERIALS SCIENCE AND ENGINEERING A》, vol. 527, 31 December 2010 (2010-12-31) * |
| 潘英才: "高碳高铬双相不锈钢组织和性能的研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》, no. 10, 15 October 2013 (2013-10-15), pages 022 - 15 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108994229A (en) * | 2018-07-16 | 2018-12-14 | 成都先进金属材料产业技术研究院有限公司 | Manufacturing method for cold-working mold thickness band steel |
| CN115679225A (en) * | 2021-07-28 | 2023-02-03 | 叶均蔚 | High chromium silicon corrosion resistant steel and use thereof |
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